Table 2.

Model test results.

Variables	Model 1		Model 2			Model 3			Model 4
	β (SE)	P value		β (SE)	P value		β (SE)	P value	β (SE)	P value
Intercept	117.974(26.243)	<.001		85.143 (27.589)	.002		19.946 (30.823)	.52	–16.145 (33.024)	.63
Phy_Style	1.119 (0.172)	<.001		1.075 (0.175)	<.001		1.067 (0.174)	<.001	1.087 (0.174)	<.001
Ques_comp	0.257 (0.057)	<.001		0.250 (0.058)	<.001		0.250 (0.057)	<.001	0.252 (0.057)	<.001
Title	–3.732 (2.945)	.21		–4.325 (2.946)	.14		–4.789 (2.935)	.10	–4.435 (2.928)	.13
Hospital_Level	–3.558 (3.680)	.33		–2.167 (3.721)	.56		–2.118 (3.705)	.57	–3.096 (3.702)	.40
Recommendation	–15.597 (7.536)	.04		–14.559 (7.511)	.05		–15.472 (7.480)	.04	–13.651 (7.466)	.07
Patient_Number	–5.166 (1.877)	.006		3.496 (3.124)	.26		4.181 (3.114)	.18	4.732 (3.113)	.13
Gift_Price	N/Aa	N/A		4.941 (1.523)	.001		31.286 (5.852)	<.001	42.321 (6.960)	<.001
Service_Price	N/A	N/A		–4.852 (1.812)	.007		–5.184 (1.805)	.004	18.870 (4.672)	<.001
Gift_Number	N/A	N/A		–5.282 (2.165)	.02		7.407 (3.472)	.03	–6.487 (2.162)	.003
Gift_Number*Gift_Price	N/A	N/A		N/A	N/A		–5.080 (1.090)	<.001	N/A	N/A
Service_Price*Gift_Price	N/A	N/A		N/A	N/A		N/A	N/A	–9.245 (1.680)	<.001

^aN/A: not applicable; the variable was not included in the model.